Commit | Line | Data |
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5039e316 DY |
1 | What: /sys/kernel/boot_params |
2 | Date: December 2013 | |
3 | Contact: Dave Young <dyoung@redhat.com> | |
4 | Description: The /sys/kernel/boot_params directory contains two | |
5 | files: "data" and "version" and one subdirectory "setup_data". | |
6 | It is used to export the kernel boot parameters of an x86 | |
7 | platform to userspace for kexec and debugging purpose. | |
8 | ||
9 | If there's no setup_data in boot_params the subdirectory will | |
10 | not be created. | |
11 | ||
12 | "data" file is the binary representation of struct boot_params. | |
13 | ||
14 | "version" file is the string representation of boot | |
15 | protocol version. | |
16 | ||
17 | "setup_data" subdirectory contains the setup_data data | |
18 | structure in boot_params. setup_data is maintained in kernel | |
19 | as a link list. In "setup_data" subdirectory there's one | |
20 | subdirectory for each link list node named with the number | |
21 | of the list nodes. The list node subdirectory contains two | |
22 | files "type" and "data". "type" file is the string | |
23 | representation of setup_data type. "data" file is the binary | |
24 | representation of setup_data payload. | |
25 | ||
26 | The whole boot_params directory structure is like below: | |
27 | /sys/kernel/boot_params | |
28 | |__ data | |
29 | |__ setup_data | |
30 | | |__ 0 | |
31 | | | |__ data | |
32 | | | |__ type | |
33 | | |__ 1 | |
34 | | |__ data | |
35 | | |__ type | |
36 | |__ version | |
37 | ||
38 | Users: Kexec |